Collapsible core or mandrel



April 28, 1925. 1,536,022

J. W. KUHN COLLAPSIBLE coma OR MANDREL i e J e 28, 1924 2 Sheets-sheaf,1

attoz wage April 28, 1925.

J. W. KUHN COLLAPSIBLE CORE 0R MANDREL Filed June 28, 1924 2Sheets-Sheet 2 adouwqa Patented A r. 28, 1925.

UNITED STATES tssnzz PATsT FFHQE.

JOHN W K UHN, OF CHILLICOTHE, OHIO.

COLLAPSIBLE CORE OR MANDBEL.

Application filed. June 28, 1924. Serial No. 723,041.

To all LU/1.0772 may concern:

. lie it known that 1, JOHN V. Knit-1N, a citizen ot the United States,residing at Ghillicothe, in the county of Ross and State at Ohio, haveinventedcertain new and useful Improvements in Collapsible Cores orMandrels, of which the following is a toll, clear, and exactdescription.

This invention relates to collapsible cores or mandrels designed for usein the manufacture cit cushion tires such as disclosed in my copendingapplication Serial No. 1 23,04? filed June 28, 1924:, and has for itsobject to provide a sectional coreinclnding master keys and wedges whichwill permit of a ready collapsing of the core to facilitate witl'idrawalthereof from the interior of the finished tire without distortion of thebeads and without undue effort.

A further objectof the invention resides Figure. 5 is a side elevationof the core with the locking rings removed.

Flgure 6 1s a side elevation ofone of the locking key wedggg Figures 7and 8 are sections taken on lines 'T7 and 8 8 respectively of Figure 6,and

Figure 9 is a perspective view of the said locking key or wedge.

Referring to the drawings more in detail, the numeral 1 indicates acomplete core or mandrel on which it. is intended that the tire be builtup and then molded. The core tion or locking key The outer sections areeach composed of a body portion on \vhichare termed three knobs orprotuberances-(i which are substantially semi-conical in shape, and thebody portion is also formed with an arc-shaped channel or groove '7 fora purpose to be later described. The interu'iediate section or lookingwedge 5 t each unit 3 is provided with three tapered lingers 8 of whichthe center finger is slightly thinner than the outer lingers in orderthat the outer sections n'iay collapse to a position in which they maybe withdrawn without seriously interfering with the beads of the tire.

The inner surfaces of the knobs 6 are provided with shoulders 9 adjacenttheir upper ends and shoulders 10 at their lower 011( s, the former toengage the upper ends of the wedge members and the latter to cooperatewith the flanges on the enlarged ends of said wedges. By thisconstruction it will he obvious that the wedge member 5 may be movedinto its exact posi tion and will be prevented from passing too far intothe core and thus expanding the same beyond its intended size.

All of the several units of the core are idei'itical except that themaster key units 3 have their ends tapered as indicated by numeral 11 inorder that the same may be drawn in ardly of the core at the beginningof the collapsing operation.

In assembling the core the outer members 4 of a section are first put inplace and the wedge 5 is then inserted, the key unit 3 of course beingthe last unit to be put in position. When thus assembled the rings 12provided with mniular ribs 13 adapted to seat in the aimular grooves 7of the several. units are bolted to the sides thereoi by means or" bolts1st and to this end the sec tions 4 are providedv with bolt receivingapertures 15 and thewedge sections 5 with bolt receiving apertures 16.By this construction it will be apparent that the sections t aresecurely locked against any relative movement.

For the purpose of inserting a tool for ,withdrawing the wedge sections5 when nec ing' the wedge.

In dismantling a tire the first step will A tool will then be insertedin the aperture 17 of the Wedge member 5 of one of the master keys andthis member will be withdrawn toward the center of the core. hen thiselement is removed the upper one of the side sections 4 of the masterkey will drop into R position in which it may be readily Withdrawnthrough the space hetiveen bends ot the tire, and the lower side sectionnmf then he withdrawn in the same inziinier. Ti lie master lif/ 3 beingremoved it will he iniderstood that each of the other units may heWithdrawn in a similar n'ninne 7 until the entire core is removed.

From the 'toreg'oingr lescription it will. be seen that i have devisd 21came or mandrel tor cushion tires Whici may he eerily and quicklyassembled or collapsed, and one in which the various elements aresecurely loc ed against re ative movement when in use.

in HCL'OTULHCG with the patent statutes 1 have described what I nowbelieve to he the best embodiment of the invention, 1 do not Wish to bennt erstood thereby is limiting myself or the scope out the invenanychanges and modifications may he nu do without departing from the spiritor the invention; all such I aim to include in l e scope oi the appendedclaims.

tion, as in section. senii-eo'ies1iep d protn ierzznees e1;- tend'red'mlv ."rom each of said outer :eeet Wedge-shamed fingers 11! saidinterint jute l of iini ts, ezic iternied 'e sci intermediate i);provided with tr verse aperture, and said enter Lions p ided withnotches; in :il ment tool 11in he to Withdraw between the vith saidertiire, whereby n and apertnre so as "ante section from the inte JOHNW. KUHN.

